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when I create one virtual drive, after reboots additional virtual drives are being added automatically without my intention, so I start with e.g. drive F: and after several reboots DT adds addl drive such as G: H: I: J: K: and so on.

So I need to delete all drives and without any drive, no drives are beeing added automatically.

Please give more clue to us.
Is your drive empty or mounted?
What type of device is added automatically (DT, SCSI, IDE)?
Is SPTD driver installed?
Do you have any physical device in your system?
How quickly does drive appear after starting OS?
Has old version of DTPro was installed on your OS? (was it update or first install on clear system)
Do you have another devices emulation software on your system?

- Drive is usually empty
- DT Drive
- SPTD is not installed
- Yes, a BluRay burner as drive E:, an Samsung SSD and a Raid Controller with 4 HGST drives attached. System is P9X79 Deluxe, 32GB RAM.
Antivirus is BitDefender
- After log in, the plug in sound of the DT drive appears in about 8 seconds
- System was a clean setup, no former release of DTPro installed
- No device emulation software but DVDFab and AnyDVD which presumably install filter drivers. However, both are not running in background usually.

I need to add something: the drives seem to be added intermittently, so there need to be made several reboots before additional drives appear.

I have the same Problem on Windows 10 Pro and I had the problem even under Windows 8.1 for about half a year.
Again and again I when reboot my pc, I have a new virtual drive in the list. I always has to remove them manually.
For one period of time I get even new physical drives I do not have.